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72 lines
1.9 KiB
C
72 lines
1.9 KiB
C
/* $Id: pattern.c,v 1.3 2005/05/13 18:52:06 harbourn Exp $
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* dcfldd - The Enhanced Forensic DD
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* By Nicholas Harbour
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*/
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/* Copyright (C) 85, 90, 91, 1995-2001, 2005 Free Software Foundation, Inc.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software Foundation,
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Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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/* GNU dd originally written by Paul Rubin, David MacKenzie, and Stuart Kemp. */
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#include "dcfldd.h"
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#include <sys/types.h>
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/* Pattern to be written out */
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char *pattern;
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size_t pattern_len;
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int input_from_pattern;
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char *make_pattern(char *pattern)
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{
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size_t plen, numbytes, i;
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char *buffer;
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plen = strlen(pattern);
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if (plen == 0 || plen % 2 != 0)
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return NULL;
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numbytes = plen / 2;
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buffer = malloc(numbytes);
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for (i = 0; i < numbytes; i++) {
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char tmpstring[3];
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int byteval;
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strncpy(tmpstring, &pattern[i*2], 2);
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tmpstring[2] = '\0';
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byteval = hex2char(tmpstring);
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if (byteval == -1) {
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free(buffer);
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return NULL;
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}
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buffer[i] = (char)byteval;
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}
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pattern_len = numbytes;
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return buffer;
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}
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void replicate_pattern(char *pattern, char *buffer, size_t size)
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{
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size_t i;
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for (i = 0; i < size; i++)
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buffer[i] = pattern[i % pattern_len];
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}
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